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On the Marina Cladocera from the Northumbrian Plankton

Published online by Cambridge University Press:  11 May 2009

Olag M. Jorgensen
Olag M. Jorgensen
Affiliation:
Armstrong College, University of Durham.
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Extract

From an analysis of previous records of E. nordmanni, considered in conjunction with those furnished by the present investigation, the following points of interest emerge.

1. E. nordmanni, while being generally distributed in the North Sea and adjacent waters throughout the summer months, has been shown to breed freely in inshore waters in early summer and again in autumn when maximum numbers of individuals are obtained.

2. These two periods of maximal abundance are produced as the result of successive parthenogenetic broods and alternate with periods of depression. This is indicated not only by the sexually-produced winter-egg, but also by a reduction in the number of embryos contained in the brood chamber and consequent change in body-shape. This serves to show that the supposedly distinct races, described as being characteristic of the North Sea and the Baltic, have no doubt been founded on material taken at different periods of the agamic phase.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 19 , Issue 1 , August 1933 , pp. 177 - 226
Copyright
Copyright © Marine Biological Association of the United Kingdom 1933

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